Frontline Spot-On Combo Cats

Frontline Combo eliminates fleas within 24 hours and has an insecticidal efficacy against new infestations with adult fleas which persists for 4 weeks. (S)-methoprene 60 mg is an insect growth regulator that prevents the multiplication of fleas by inhibiting the development of eggs (ovicidal activity), larvae and pupae (larvicidal activity) originating from eggs laid by adult fleas. Effects persist for 6 weeks after application.